1 Answer
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The line <Property Name="QueryPromptString">$Resources:MyResourceFile,ResourceKey</Property> wokrs fine for me.
I think that you should check your resources file. This file should contain ResourceKey which you tries to use in this property.

If you use correct resource file and key, the search control displays text depends on the site language. If you would like to change this text dynamically as you see in the picture below, you should do some more complex steps.

Thanks Alexander, you are right, the line was correct. However, I was pointing to an application resource file where I needed to point to a provisioning resource file. Once I moved the ResourceKey from one file to the other, it worked.
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Hugo MigneronMay 24 '12 at 15:17